化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (3) : 289-293. DOI: 10.19817/j.cnki.issn1006-3536.2023.03.051

开发与应用

α-CoMoO₄和β-CoMoO₄的制备及电化学性能研究

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Preparation and electrochemical properties of α-CoMoO₄ and β-CoMoO₄

Huangfu Zhanbiao^1,2, Guo Dongfang^1,2, Liang Liming^1,2, Liu Xuekun^1,2, Liang Yongfu^1,2, Cheng Xuerui^1,2, Yang Kun^1,2

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Received		Published
2021-11-26		2023-03-20
Issue Date	Revised Date
2023-03-29	2021-11-26

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摘要

采用水热法成功合成CoMoO₄样品,采用X射线衍射、拉曼光谱和电学化学工作站研究了退火温度对样品结构和电化学性能的影响。结果表明,低温制备样品为β相CoMoO₄,高于600℃退火时向高温相α-CoMoO₄转变,1000℃时完全相变为高温α-CoMoO₄。伴随β→α相变,其在可见光区域的吸收增强,且光学带隙逐渐减小。电化学研究结果表明,两种结构的CoMoO₄都具有典型的赝电容特性,但α-CoMoO₄具有更低的瓦尔堡阻抗,且充放电容量明显大于β-CoMoO₄,证实α-CoMoO₄具有更优越的电容性能,在储能领域存在较大的应用前景。

Abstract

In the present work,CoMoO₄ samples were successfully synthesized by hydrothermal method.The effects of annealing temperature on the structures and electrochemical properties of the samples were investigated by X-ray diffraction,Raman spectroscopy and electrochemical workstation.The results showed that the β phase CoMoO₄ sample was obtained at low temperature.It transformed to α-CoMoO₄ when the annealing temperature was above 600℃,and the β→α phase transition was finally completed at 1000℃.Along with the β→α phase transition,its absorption was obviously enhanced in the visible region and its optical band gap was gradually reduced.The electrochemical result exhibited that both CoMoO₄ samples of two structures had typical pseudocapacitance characteristics.However,α-CoMoO₄ had much lower Valborg resistance and significantly larger charge/discharge capacity than β-CoMoO₄.Consequently,it was confirmed that α-CoMoO₄ had superior capacitance performance to β-CoMoO₄ and had great application prospects in the field of energy storage.

关键词

水热法 / CoMoO₄ / 电化学 / 超级电容器 / 吸收光谱

Key words

hydrothermal method / CoMoO₄ / electrochemistry / supercapacitor / absorption spectroscopy

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α-CoMoO₄和β-CoMoO₄的制备及电化学性能研究[J]. 化工新型材料, 2023, 51(3): 289-293 DOI:10.19817/j.cnki.issn1006-3536.2023.03.051

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